/**
<div id=img1 style="Z-INDEX: 100; LEFT: 2px; WIDTH: 59px; POSITION: absolute; TOP: 43px; HEIGHT: 61px; visibility: visible;">
<a href="#" target="_blank">
<img src="../../image/teacher/mainBG.png" width="80" height="80" border="0">
</a>
</div>
*/
//<script language="javascript">
var xPos = 300;
var yPos = 200; 
var step = 1;
var delay = 30; 
var width = 0;
var height = 0;
var Hoffset = 0;
var Woffset = 0;
var yon = 0;
var xon = 0;
var pause = true;
var interval;
img1.style.top = yPos;
function changePos() 
{    
	width = document.body.clientWidth;    
	height = document.body.clientHeight;    
	Hoffset = img1.offsetHeight;    
	Woffset = img1.offsetWidth;    
	img1.style.left = xPos + document.body.scrollLeft;    
	img1.style.top = yPos + document.body.scrollTop;    
	if (yon)         
	{yPos = yPos + step;}    
	else         
	{yPos = yPos - step;}    
	if (yPos < 0)         
	{yon = 1;yPos = 0;}    
	if (yPos >= (height - Hoffset))         
	{yon = 0;yPos = (height - Hoffset);}    
	if (xon)         
	{xPos = xPos + step;}    
	else         
	{xPos = xPos - step;}    
	if (xPos < 0){xon = 1;xPos = 0;}    
	if (xPos >= (width - Woffset))         
	{xon = 0;xPos = (width - Woffset);   }    
}        
function start()     
{         
	img1.visibility = "visible";        
	interval = setInterval('changePos()', delay);    
}    
function pause_resume()     
{   if(pause)         
	{            
	clearInterval(interval);           
	pause = false;}        
	else         
	{            
	interval = setInterval('changePos()',delay);            
	pause = true;             
	}        
}    
start();
//</script>
